нянчить детей

Hi,
What would be the correct way to say "нянчить детей" when we talk about grandparents?
The context is "А уж нянчить — то внуков нянчить будите…"
It is said to an old couple.
My attempts are "As to minding — you will mind your grandchildren…” or "As to nursing — you will nurse your grandchildren…”